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Related Party Arrangements - Investments in Joint Ventures (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Oct. 31, 2018
Dec. 31, 2015
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Nov. 01, 2018
Dec. 31, 2014
Related Party Transaction [Line Items]              
Investment portfolio     $ 1,733,019   $ 1,778,914    
Payments to acquire interest in joint venture     $ 39,801 $ 4,470      
American Healthcare Investors, LLC | Sponsor              
Related Party Transaction [Line Items]              
Ownership interest (as a percentage)             43.00%
American Healthcare Investors, LLC | Mr. James F. Flaherty III              
Related Party Transaction [Line Items]              
Ownership interest (as a percentage)             12.30%
The Trilogy Portfolio              
Related Party Transaction [Line Items]              
Ownership interest (as a percentage) 29.00% 29.00% 23.20%     23.00%  
Investment portfolio   $ 1,200,000          
Payments to acquire interest in joint venture   $ 201,700 $ 2,400        
Ownership interest sold (as a percentage) 20.00%            
Proceeds from sale of equity method investments $ 48,000            
Winterfell              
Related Party Transaction [Line Items]              
Ownership interest (as a percentage)     20.00%        
Winterfell | Solstice Senior Living              
Related Party Transaction [Line Items]              
Ownership interest (as a percentage)     80.00%        
Solstice Senior Living | Corporate Joint Venture              
Related Party Transaction [Line Items]              
Property management fee expense paid to joint venture     $ 2,600